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The museum is a bit tricky to navigate in this giant stadium, but once you find it - entrance located on the bottom floor, left doors - it is a single mass hall filled with photos, artifacts, and other information regarding the sumo life , the history and their training. There are also English captions in the interaction videos and display boards which are convenient for tourists to read. You can get a souvenir stamp too, for free, with the free admission here. There is a gift shop and washrooms nearby too.
The Sumo museum is a great place to visit if you're in the area and are curious about Sumo life. There's quite a lot that I have learned here!